CN111112624A - Metal droplet centrifugal additive manufacturing device and manufacturing method - Google Patents
Metal droplet centrifugal additive manufacturing device and manufacturing method Download PDFInfo
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- CN111112624A CN111112624A CN202010125313.5A CN202010125313A CN111112624A CN 111112624 A CN111112624 A CN 111112624A CN 202010125313 A CN202010125313 A CN 202010125313A CN 111112624 A CN111112624 A CN 111112624A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention discloses a metal droplet centrifugal additive manufacturing device and a manufacturing method, wherein the metal droplet centrifugal additive manufacturing device comprises the following steps: the motor, the cavity shaft, the outer layer bushing and the adjusting sleeve; the cavity shaft is rotatably arranged in the outer layer bushing, and the motor is used for driving the cavity shaft to rotate; a cavity is arranged in the cavity shaft and used for placing a solid metal material; the outer wall of the cavity shaft is provided with an induction coil for heating and melting the solid metal material placed in the cavity; one end of the cavity shaft is provided with a micropore which is communicated with the cavity and used for throwing out the molten liquid metal through centrifugal force; one end of the cavity shaft, which is provided with the micropores, is provided with an adjusting sleeve; the adjusting sleeve is provided with a groove, and the micro-hole can be coincided with the groove by moving the adjusting sleeve, so that the liquid metal is thrown out. The invention can realize metal additive manufacturing under the condition of no-gravity or microgravity environment.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a metal droplet centrifugal additive manufacturing device and a manufacturing method.
Background
The additive manufacturing technology is developed to the present stage, and the main additive manufacturing technologies are as follows: SLA technology, FDM technology, SLM technology, SLS technology, laser cladding deposition technology, arc welding material adding technology and the like; each technique has its own advantages and disadvantages which limit the scope of use of the technique. With the development of the space technology, various spacecrafts and space stations gradually become the major nations to pay attention to the content, and the space manufacturing technology has restricted the key problem of the development of the deep space technology in the future. The traditional manufacturing technology cannot be applied to space manufacturing, the search of a new space manufacturing technology becomes a bypassing way for people to go to deep space travel, and the characteristic that the additive manufacturing technology is manufactured in a mode-free digital mode becomes a key focus technology for the development of space technologies of various countries.
In the current stage of research of an additive manufacturing technology in the space field, FDM printing is mainly focused on the space microgravity environment condition, other additive manufacturing technologies are limited by characteristics of the additive manufacturing technology and are not suitable for the space microgravity environment, the FDM printing technology is mainly focused on polymer printing or polymer composite material printing in the space field, the FDM printing technology is not suitable for metal material printing, and the space additive manufacturing technology is urgently needed to be developed to be suitable for space manufacturing in the future so as to solve the problem of space on-orbit metal material printing.
In summary, a new additive manufacturing technology is urgently needed, space printing of metal parts can be realized regardless of space microgravity environment, technical support is provided for on-orbit additive manufacturing of metal parts space, and the technology has important value and significance for development of space technology and deep space star-level travel in the future.
Disclosure of Invention
The invention aims to provide a metal droplet centrifugal additive manufacturing device and a manufacturing method, and aims to solve the technical problem of metal additive manufacturing under the space environment condition. The device and the method can be used for quickly printing and manufacturing the metal parts under the condition of space microgravity or gravity-free environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a metal droplet centrifugal additive manufacturing device, which comprises: the motor, the cavity shaft, the outer layer bushing and the adjusting sleeve;
the cavity shaft is rotatably arranged in the outer layer bushing, and the motor is used for driving the cavity shaft to rotate;
a cavity is arranged in the cavity shaft and used for placing a solid metal material; the outer wall of the cavity shaft is provided with an induction coil which is used for heating and melting the solid metal material placed in the cavity; one end of the cavity shaft is provided with a micropore which is communicated with the cavity and used for throwing out the molten liquid metal through centrifugal force;
the adjusting sleeve is arranged at one end of the cavity shaft, which is provided with the micropores; the adjusting sleeve is provided with a groove, and the micropores can be coincided with the groove by moving the adjusting sleeve, so that liquid metal is thrown out.
The invention is further improved in that the outer wall of the cavity shaft is provided with an annular groove; the induction coil is embedded in the annular groove.
The invention is further improved in that the diameter size of the micropores is 0.5 mm-3 mm; the number of the micropores is one, and the micropores are used for realizing line printing.
The invention is further improved in that the cavity in the cavity shaft is provided with a step for preventing the metal liquid drops from overflowing along the axis due to centrifugal force.
The invention is further improved in that the diameter size of the micropores is 0.5 mm-3 mm; the number of the micropores is multiple, and micropore groups in preset arrangement shapes are formed and used for realizing surface printing.
The invention is further improved in that the adjusting sleeve is mounted on the cavity shaft in a manner of axially moving along the cavity shaft; the adjusting sleeve is provided with a plurality of fan-shaped grooves, and the angle range of the fan-shaped angle is 30-90 degrees.
A further development of the invention is that the motor is a servomotor.
The invention has the further improvement that a push rod is arranged in the cavity and used for pushing the liquid metal to enable the liquid metal to be tightly attached to the inner wall of the cavity.
The invention discloses a centrifugal additive manufacturing method of metal droplets, which comprises the following steps:
and 4, adjusting the distance between the forming surface and the cavity axis, repeating the step 3, and stacking layer by layer to form the three-dimensional solid metal piece.
Compared with the prior art, the invention has the following beneficial effects:
the manufacturing device is novel metal additive manufacturing equipment based on a space environment, can perform rapid printing manufacturing on metal parts under the space microgravity or gravity-free environment condition, and provides basic equipment for on-track manufacturing or metal part repairing of future space metal parts. In the existing-stage additive manufacturing technology, only an FDM (fused deposition modeling) technology is available for space on-track manufacturing, and the FDM technology can only print a polymer composite material and cannot meet the metal space additive manufacturing requirement; the device of the present invention innovatively proposes a centrifugal additive manufacturing technology, and as can be known from newton's classical mechanics, F ═ mxa (where F is a centrifugal force, M is a mass, and a is an acceleration), and a ═ ω2X R (ω is angular velocity, R is radius of rotation), F ═ M × ω2And x R. As can be seen from the above, if the object has a certain mass, a certain angular velocity, and a rotational motion around a certain radius, the object will generate a centripetal force. The device of the invention is a device for controlling the trend of metal liquid drops based on centrifugal force, breaks through the technical problem that the conventional method cannot carry out metal additive manufacturing in the space microgravity (or no gravity) environment, has substantial technical breakthrough compared with the prior art, solves the feasibility problem of space metal additive manufacturing, enables space on-orbit manufacturing to become possible, and can provide improvement for space warfare and deep space star-level travel in the futureProviding for a substantially feasible fabrication technique.
In the invention, the cavity in the cavity shaft is provided with the step, and the step is used for preventing metal liquid drops from overflowing along the axis due to centrifugal force in the rotating process.
The manufacturing method is a new metal additive manufacturing process based on the space environment, can perform rapid printing manufacturing of metal parts under the space microgravity or gravity-free environment condition, and provides a new process method for on-track manufacturing or metal part repairing of future space metal parts. In the existing-stage additive manufacturing technology, only an FDM (fused deposition modeling) technology is available for space on-track manufacturing, and the FDM technology can only print a polymer composite material and cannot meet the metal space additive manufacturing requirement; the method of the present invention innovatively proposes a centrifugal additive manufacturing technology, and as can be known from newton's classical mechanics, F ═ mxa (where F is a centrifugal force, M is a mass, and a is an acceleration), and a ═ ω2X R (ω is angular velocity, R is radius of rotation), F ═ M × ω2And x R. As can be seen from the above, if the object has a certain mass, a certain angular velocity, and a rotational motion around a certain radius, the object will generate a centripetal force. The process method of the invention is a process for controlling the trend of metal liquid drops based on centrifugal force, breaks through the technical problem that the conventional method can not carry out metal additive manufacturing in the space microgravity (or no gravity) environment, has substantial technical breakthrough compared with the prior art, solves the feasibility problem of space metal additive manufacturing, enables space on-orbit manufacturing to be possible, and can provide a substantially feasible manufacturing technology for space warfare and deep space star-level travel in the future.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a metal droplet centrifugal additive manufacturing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the cavity shaft of FIG. 1;
FIG. 3 is a schematic cross-sectional view of a cavity axis in an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a cavity shaft in accordance with yet another embodiment of the present invention;
in fig. 1 to 4, 1, a cavity; 2. an outer layer liner; 3. a cavity shaft; 4. an adjusting sleeve; 5. an annular groove; 6. micropores; 7. a group of microwells; 8. and (4) a step.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, a centrifugal additive manufacturing apparatus for metal droplets according to an embodiment of the present invention includes: servo motor, cavity axle 3, induction coil, outer layer bush 2 and adjusting collar 4. The device disclosed by the invention can be used for throwing out the metal liquid drops by adopting a centrifugal force to stack and realize metal additive manufacturing under the condition of a gravity-free environment.
Referring to fig. 2, a cavity 1 is arranged in the cavity shaft 3 and used for placing a solid metal material; the cavity 1 is provided with a step 8 which is used for preventing metal liquid drops from overflowing along the axis due to centrifugal force in the rotating process, the outer wall of the cavity shaft 3 is provided with an annular groove 5, and an induction coil is embedded in the annular groove 5; one end of the cavity shaft 3 is provided with a micropore 6, and the diameter of the micropore 6 is 0.5 mm-3 mm; the servo motor is used for driving the cavity shaft 3 to rotate, and the liquid metal can be thrown out through the micropores 6 to perform line printing through the control of the rotating centrifugal force.
Optionally, one end of the cavity shaft 3 is provided with a micropore group 7 (which may be provided with a row of micropores 6), the diameter of each micropore 6 is 0.5 mm-3 mm, and through the control of the rotating centrifugal force, liquid metal is thrown out through the micropores 6 to perform surface printing.
Preferably, the adjusting sleeve 4 can axially move along the cavity shaft 3, a group of grooves (the grooves are in a fan shape, the angle is 30-90 degrees) are formed in the adjusting sleeve 4, the cavity shaft 3 rotates, and metal liquid drops are thrown out through the hollow shaft micropores 6 and the grooves in the adjusting sleeve 4 under the action of centrifugal force and are stacked on a forming surface.
The centrifugal additive manufacturing device for the metal droplets drives the metal droplets to move according to a certain track by adopting centrifugal force, so that the metal droplets are attached to a forming surface to be adhered and solidified, the process is circulated, the metal droplets are accumulated and solidified layer by layer to form a three-dimensional solid metal part, additive manufacturing can be carried out in a mode of driving the metal droplets by the centrifugal force in a space microgravity (or zero gravity) environment, and the conventional technology (the conventional metal additive manufacturing technology is carried out under the condition of the earth gravity environment, and powder is laid by the material gravity or molten droplets fall down) is broken through.
The working process of the set of metal droplet centrifugal additive manufacturing device provided by the embodiment of the invention comprises the following steps: the solid metal material is placed in the cavity 1, and the solid metal material in the cavity 1 is heated by adopting an induction coil wound outside the cavity shaft 3 to be melted into liquid; an axial thrust is provided for the metal liquid in the cavity 1 through a push rod in the cavity 1, so that the metal liquid in the cavity 1 is stressed to be tightly attached to the inner wall of the cavity 1, a servo motor is adopted to drive the cavity shaft 3 to rotate, the liquid metal in the cavity 1 is driven to rotate around the axis of the cavity shaft 3 under the drive of the friction force of the inner wall of the cavity 1, and the metal liquid has certain mass, angular velocity, linear velocity and rotation radius according to the centrifugal force principle F (M x omega)2Xr indicates that the molten metal generates centrifugal force, and the molten metal is thrown out through the pores 6 formed in the wall of the hollow shaft 3 by the centrifugal force. An adjusting sleeve 4 is arranged outside an area of the cavity shaft 3 with the micropores 6, a row of grooves (with the groove distance being fan-shaped and the angle being 30-90 degrees) are formed in the adjusting sleeve 4, the adjusting sleeve 4 is used for controlling the centrifugal throwing-out trend of the metal liquid drops, the micropores 6 (with the diameter of 0.5-3 mm) on the cavity shaft 3 can throw out the internal liquid metal due to the centrifugal force only when the cavity shaft 3 rotates to a certain position (the micropores 6 are superposed with the grooves), and the adjusting sleeve 4 is used for controlling the throwing-out of the metal liquid dropsThe metal droplets fly forwards in a certain direction in the flying direction, the position of the forming surface is adjusted to enable the position of the forming surface to be parallel to the axial direction of the cavity shaft 3, the distance between the forming surface and the cavity shaft 3 is adjusted through an automatic control technology, the flying track thrown out by the droplets is well arranged in the outline of the part to be formed, the metal droplets are adhered and solidified, and the three-dimensional solid is formed by overlapping layer by layer.
Referring to fig. 3, in the embodiment of the present invention, the cavity shaft 3 has only one micro-hole 6 structure; the motor drives the cavity shaft 3 to rotate, the metal liquid is ejected out of the micropores 6 under the action of centrifugal force, the metal liquid flies out along the tangential direction of the cavity shaft 3 through the grooves on the adjusting sleeve 4, the metal liquid drops fly out in a linear shape and fly to the forming surface to be adhered to the forming surface for solidification, the cavity shaft 3 rotates for one circle, the metal liquid flies out of a liquid metal wire under the action of the centrifugal force, the metal liquid is adhered to the forming surface for solidification to form wire printing, and a three-dimensional entity is formed through circulation action, so that the efficient wire printing of the metal material under the environment condition of space zero gravity or microgravity is realized.
Referring to fig. 4, in the embodiment of the present invention, the structure of the micropores 6 on the cavity shaft 3 is changed, so that the micropores 6 are arranged in a row to form a micropore group 7, which specifically includes: a row of micro-hole groups 7 are formed in the cavity shaft 3, the cavity shaft 3 is driven to rotate through a motor, metal liquid is ejected out of the micro-hole groups 6 under the action of centrifugal force, and flies out along the tangential direction of the cavity shaft 3 through the grooves in the adjusting sleeve 4, metal liquid drops fly out in a wide band shape, fly to a forming surface, are adhered to the forming surface to be solidified, and are circulated to form a three-dimensional entity, so that efficient surface printing of the metal material under the environment condition of space zero gravity or micro-gravity is achieved.
The centrifugal additive manufacturing method for the metal liquid drops comprises the following steps: :
step 1: heating the cavity shaft by using an induction coil to melt the metal in the cavity shaft;
step 2: the servo motor drives the cavity shaft to rotate at a certain speed, and molten metal is thrown out through the micropores on the cavity shaft under the action of centrifugal force through rotation, so that metal droplets are adhered to a forming surface.
And step 3: and (3) adjusting the distance between the forming surface and the cavity axis, repeating the step (2), and stacking layer by layer to form the three-dimensional solid metal piece.
The invention relates to a liquid drop centrifugal additive manufacturing device and a method, which are novel metal additive manufacturing equipment and a method based on a space environment2X R (ω is angular velocity, R is radius of rotation), F ═ M × ω2And x R. As can be seen from the above, if the object has a certain mass, a certain angular velocity, and a rotational motion around a certain radius, the object will generate a centripetal force. The device and the method for controlling the trend of the metal liquid drops based on the centrifugal force break through the technical problem that the conventional method cannot perform metal additive manufacturing in a space microgravity (or non-gravity) environment, compared with the prior art, the device and the method have substantial technical breakthrough, solve the feasibility problem of space metal additive manufacturing, enable space on-orbit manufacturing to be possible, and provide a practical and feasible manufacturing technology for space warfare and deep space star-level travel in the future.
In summary, the present invention discloses a metal droplet centrifugal additive manufacturing apparatus and method, including: the device comprises a servo motor, a cavity shaft, an induction coil, an outer layer bushing and an adjusting sleeve; metal liquid drops are thrown out by centrifugal separation, and are stacked and formed, so that metal additive manufacturing under the condition of space and gravity-free or microgravity environment is realized; the cavity inside the cavity shaft is provided with steps, the outside of the cavity shaft is provided with a groove, an induction coil is embedded in the groove, one end of the cavity shaft is provided with a micropore, the diameter of the micropore is 0.5 mm-3 mm, and the adjusting sleeve is provided with a group of grooves; the cavity shaft rotates, liquid metal is thrown out through the micropores of the hollow shaft and the grooves in the sleeve under the action of centrifugal force and is accumulated on the forming surface, and the liquid metal is attached to and solidified on the forming surface and is superposed layer by layer to form a three-dimensional entity. And metal additive manufacturing under the condition of no-gravity or microgravity environment is realized.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (9)
1. A centrifugal additive manufacturing apparatus of metal droplets, comprising: the motor, the cavity shaft (3), the outer layer bushing (2) and the adjusting sleeve (4);
the cavity shaft (3) is rotatably arranged in the outer layer bushing (2), and the motor is used for driving the cavity shaft (3) to rotate;
a cavity (1) is arranged in the cavity shaft (3) and used for placing a solid metal material; an induction coil is arranged on the outer wall of the cavity shaft (3) and used for heating and melting the solid metal material placed in the cavity (1); one end of the cavity shaft (3) is provided with a micropore (6), and the micropore (6) is communicated with the cavity (1) and used for throwing out molten liquid metal through centrifugal force;
the adjusting sleeve (4) is arranged at one end of the cavity shaft (3) provided with the micropore (6); the adjusting sleeve (4) is provided with a groove, and the micropore (6) can be coincided with the groove by moving the adjusting sleeve (4), so that liquid metal can be thrown out.
2. A centrifugal additive manufacturing device of metal droplets as claimed in claim 1, characterized in that the outer wall of the cavity shaft (3) is provided with an annular groove (5); the induction coil is embedded in the annular groove (5).
3. A centrifugal additive manufacturing device of metal droplets as recited in claim 1, characterized in that the diameter of the micro-holes (6) is 0.5mm to 3 mm; the number of the micropores (6) is one, and the micropores are used for realizing line printing.
4. A centrifugal additive manufacturing device for metal droplets according to claim 1, characterized in that the cavity (1) in the cavity shaft (3) is provided with a step (8) for preventing centrifugal force from causing metal droplets to overflow along the axis.
5. A centrifugal additive manufacturing device of metal droplets as recited in claim 1, characterized in that the diameter of the micro-holes (6) is 0.5mm to 3 mm; the number of the micropores (6) is multiple, and a micropore group (7) with a preset arrangement shape is formed and is used for realizing surface printing.
6. A metal droplet centrifugal additive manufacturing device according to claim 1, wherein the adjusting sleeve (4) is mounted on the cavity shaft (3) axially movable along the cavity shaft (3); the adjusting sleeve (4) is provided with a plurality of fan-shaped grooves, and the angle range of the fan-shaped angle is 30-90 degrees.
7. A centrifugal additive manufacturing device of metal droplets according to claim 1, wherein said motor is a servo motor.
8. A centrifugal additive manufacturing device for metal droplets as recited in claim 1, characterized in that a push rod is arranged in the cavity (1) for pushing the liquid metal to be tightly attached to the inner wall of the cavity (1).
9. A metal droplet centrifugal additive manufacturing method is characterized in that the metal droplet centrifugal additive manufacturing device based on claim 1 comprises the following steps:
step 1, putting a solid metal material into a cavity (1) of the cavity shaft (3);
step 2, heating the cavity shaft (3) by the induction coil to melt the solid metal material in the cavity (1) into liquid metal;
step 3, the motor drives the cavity shaft (3) to rotate at a preset speed, so that the liquid metal is thrown out through the micropores (6) under the action of centrifugal force, and the metal liquid drops are adhered to the forming surface;
and 4, adjusting the distance between the forming surface and the cavity shaft (3), repeating the step 3, and stacking layer by layer to form the three-dimensional solid metal piece.
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| CN202010125313.5A CN111112624B (en) | 2020-02-27 | 2020-02-27 | Metal droplet centrifugal additive manufacturing device and manufacturing method |
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| FR2922794A1 (en) * | 2007-10-24 | 2009-05-01 | Joel Henri Auguste Soulier | Sintering powdery materials e.g. mixture of tungsten, nickel, lithium and manganese, by transforming heated material into insulation mold, and subjecting material in mold to centrifugal force and to exposure of electromagnetic field |
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| CN110695493A (en) * | 2019-10-30 | 2020-01-17 | 上海交通大学 | Metal additive manufacturing device |
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2020
- 2020-02-27 CN CN202010125313.5A patent/CN111112624B/en active Active
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| FR2922794A1 (en) * | 2007-10-24 | 2009-05-01 | Joel Henri Auguste Soulier | Sintering powdery materials e.g. mixture of tungsten, nickel, lithium and manganese, by transforming heated material into insulation mold, and subjecting material in mold to centrifugal force and to exposure of electromagnetic field |
| CN104626581A (en) * | 2015-01-19 | 2015-05-20 | 西安交通大学 | Space complex environment oriented multi-degree of freedom 3D printer and printing method |
| CN105479741A (en) * | 2015-06-12 | 2016-04-13 | 青岛智能产业技术研究院 | 3D printing system for space environment |
| EP3117982B1 (en) * | 2015-07-16 | 2019-12-25 | Sculpman Bvba | 3d printing system and process |
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| CN108526468A (en) * | 2018-04-25 | 2018-09-14 | 西北工业大学 | The physical system and Method of printing of molten drop 3D printing in stimulated microgravity |
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| CN110695493A (en) * | 2019-10-30 | 2020-01-17 | 上海交通大学 | Metal additive manufacturing device |
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